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- Otava mental skill for sports 3 - validation and gender invariance for the portuguese versionPublication . Silva, Carlos; Torres, Diana; Louro, Hugo gonçalo Duarte; Borrego, Carla; Batista, MarcoThe aim of the study was to validate the Portuguese version of the Ottawa Mental Skills Assessment Tool (OMSAT 3p) through confirmatory factor analyses of the measurement model, and gender invariance. A total of 524 Portuguese athletes (male and female) aged between 12 and 42 years old, participated in this study (M = 19.21; SD = 5.46). The main results show that the psychometric qualities of the 48-item OMSAT 3 are adequate and that it has acceptable validity, allowing it to assess Foundation Skills (SRMR = 0.042, CFI = 0.999, TLI = 0.998, RMSEA = 0.008 and χ2 /df = 1.46), Psychosomatic Skills (SRMR = 0.056, CFI = 0.979, TLI = 0.975, RMSEA = 0.042 and χ2 /df = 1.93) and Cognitive Skills (SRMR = 0.058, CFI = 0.973, TLI = 0.968, RMSEA = 0.044 and χ2/df =1.99). This version also showed adequate values for configural, metric and scalar invariance by gender (ΔCFI < 0.01) (ΔRMSEA<0,01). The Portuguese version of the OMSAT 3 can be used with reasonable confidence to assess psychological skills in a sports context.